def get_verifying_key(serialized_msg, serialized_sig):
"""Attempts to recover a public key from a message and a signature.
Args:
serialized_msg (str): A serialized message.
serialized_sig (str): A serialized signature.
Returns:
str: a public key.
"""
v, r, s = pybitcointools.decode_sig(serialized_sig)
msghash = pybitcointools.electrum_sig_hash(serialized_msg)
z = pybitcointools.hash_to_int(msghash)
compress = True if v >= 31 else False
if compress:
rec = v - 31
else:
rec = v - 27
try:
pubkey = nativeECDSA.recover_pubkey(
str(z), str(r), str(s), int(rec))
except Exception as ex:
logger.warn('Unable to extract public key from signature' + ex.args[0])
return ""
pubkey = pubkey.translate(None,
'h') # strip out hex indicators from opencpp
pubkey = '04' + pubkey # indicate uncompressed pubkey
if compress:
pubkey = pybitcointools.compress(pubkey)
return pubkey
def recover_pubkey(message, signature):
v, r, s = pybitcointools.decode_sig(signature)
msghash = pybitcointools.electrum_sig_hash(message)
z = pybitcointools.hash_to_int(msghash)
compress = True if v >= 31 else False
if compress:
rec = v - 31
else:
rec = v - 27
try:
pubkey = nativeECDSA.recover_pubkey(str(z), str(r), str(s), int(rec))
except ValueError as ex:
LOGGER.warning('Unable to extract public key from signature' +
ex.args[0])
return ""
try:
# pybitcointools package
pubkey = pubkey.translate(None, 'h')
except TypeError:
# bitcoin package
pubkey = pubkey.translate('h')
pubkey = '04' + pubkey
if compress:
pubkey = pybitcointools.compress(pubkey)
return pubkey
def get_verifying_key(serialized_msg, serialized_sig):
"""Attempts to recover a public key from a message and a signature.
Args:
serialized_msg (str): A serialized message.
serialized_sig (str): A serialized signature.
Returns:
str: a public key.
"""
v, r, s = pybitcointools.decode_sig(serialized_sig)
msghash = pybitcointools.electrum_sig_hash(serialized_msg)
z = pybitcointools.hash_to_int(msghash)
compress = True if v >= 31 else False
if compress:
rec = v - 31
else:
rec = v - 27
try:
pubkey = nativeECDSA.recover_pubkey(
str(z), str(r), str(s), int(rec))
except Exception as ex:
logger.warn('Unable to extract public key from signature' + ex.args[0])
return ""
pubkey = pubkey.translate(None,
'h') # strip out hex indicators from opencpp
pubkey = '04' + pubkey # indicate uncompressed pubkey
if compress:
pubkey = pybitcointools.compress(pubkey)
return pubkey
def address(self):
if self._type == PubkeyType.compressed:
bin_hash160 = get_bin_hash160(compress(self.to_bin()))
return bin_hash160_to_address(
bin_hash160, version_byte=self._version_byte)
return bin_hash160_to_address(self.bin_hash160(),
version_byte=self._version_byte)
def address(self):
if self._type == PubkeyType.compressed:
bin_hash160 = get_bin_hash160(compress(self.to_bin()))
return bin_hash160_to_address(bin_hash160,
version_byte=self._version_byte)
return bin_hash160_to_address(self.bin_hash160(),
version_byte=self._version_byte)
def test_compressed_keys(self):
"""
Tests compressed key
"""
msg = 'foo'
priv = pbt.encode_privkey(pbt.random_key(), 'hex_compressed')
sig = pbt.ecdsa_sign(msg, priv)
# Force old pybitcointools to behave
v, r, s = pbt.decode_sig(sig)
if v < 31:
v += 4
sig = pbt.encode_sig(v, r, s)
pub = pbt.compress(pbt.privtopub(priv))
native_recovered = pbct_nativerecover.recover_pubkey(msg, sig)
self.assertEquals(native_recovered, pub,
"Priv Key that failed: {}".format(priv))
def test_compressed_keys(self):
"""
Tests compressed key
"""
msg = 'foo'
self.longMessage = True
priv = pbt.encode_privkey(pbt.random_key(), 'hex_compressed')
sig = pbt.ecdsa_sign(msg, priv)
# Force old pybitcointools to behave
v, r, s = pbt.decode_sig(sig)
if v < 31:
v += 4
sig = pbt.encode_sig(v, r, s)
pub = pbt.compress(pbt.privtopub(priv))
native_recovered = gossip.signed_object.get_verifying_key(msg, sig)
self.assertEquals(native_recovered, pub,
"Priv Key that failed: {}".format(priv))
def test_compressed_keys(self):
"""
Tests compressed key
"""
msg = 'foo'
self.longMessage = True
priv = pbt.encode_privkey(pbt.random_key(), 'hex_compressed')
sig = pbt.ecdsa_sign(msg, priv)
# Force old pybitcointools to behave
v, r, s = pbt.decode_sig(sig)
if v < 31:
v += 4
sig = pbt.encode_sig(v, r, s)
pub = pbt.compress(pbt.privtopub(priv))
native_recovered = gossip.signed_object.get_verifying_key(msg, sig)
self.assertEquals(native_recovered, pub,
"Priv Key that failed: {}".format(priv))
def public_key(self, compressed=False):
# lazily calculate and set the public key
if not hasattr(self, '_public_key'):
ecdsa_public_key = self._ecdsa_private_key.get_verifying_key()
# compress the public key string if a compressed public key is
# desired
bin_public_key_string = PUBKEY_MAGIC_BYTE + \
ecdsa_public_key.to_string()
if compressed:
bin_public_key_string = compress(bin_public_key_string)
# create the public key object from the public key string
self._public_key = BitcoinPublicKey(
bin_public_key_string,
version_byte=self._pubkeyhash_version_byte)
# return the public key object
return self._public_key
def public_key(self):
# lazily calculate and set the public key
if not hasattr(self, '_public_key'):
ecdsa_public_key = self._ecdsa_private_key.get_verifying_key()
bin_public_key_string = PUBKEY_MAGIC_BYTE + \
ecdsa_public_key.to_string()
if self._compressed:
bin_public_key_string = compress(bin_public_key_string)
# create the public key object from the public key string
self._public_key = BitcoinPublicKey(
bin_public_key_string,
version_byte=self._pubkeyhash_version_byte)
# return the public key object
return self._public_key
# This will generate the hashed uncompressed public key, # that is, the "bitcoin address" that you share with others. # Again, the uncompressed format is not recommended anymore. # # The sharable bitcoin address: public_address_uncompressed = utils.public_address(public_key_version) # THE COMPRESSED KEY # Compressed keys only specify the x coordinate plus an 1 byte # flag indicating which side of the symmetrical curve the point is on, which allows y to be derived. # In order to indicate that key is compressed, "02" or "03" prefix is added to the encoded hex value. # The "02" and "03" is determined based on the the elliptic curve equation result. # # Public key with compression (32 bytes + 1 byte prefix = 33 bytes), in hex encoding public_key_version_comp = pybitcointools.compress(public_key_version) # This will generate the compressed public key, # that is, the "bitcoin address" that you share with others. # This is the modern and recommended format. # # The sharable bitcoin address (hashed public key for P2PKH script format, starts with 1). # There is a newer P2SH format, so addresses for transactions using this script format start # with number 3. public_address_compressed = utils.public_address(public_key_version_comp) # WE ARE DONE. # Let's now print the WIF's and their corresponding Bitcoin public addresses. # We are also going to verify that our public keys were correctly generated, comparing # our public addresses with those generated by pybitcoin library: # https://github.com/blockstack/pybitcoin
